<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .container {
        display: flex;
        justify-content: flex-start;
        align-items: flex-start;
        border: 1px solid red;
    }
</style>
<body>
<div class="container">
    <div>内容1</div>
    <div>内容2</div>
    <div>内容3</div>
</div>
</body>
</html>
